Prediction of long-distance migration of rice planthoppers, Nilaparvata lugens and Sogatella furcifera to northern kyushu using numerical weather prediction chart for wind and equivalent potential temperature at 850 hPa

The massive immigration of rice planthoppers was forecasted based on the nu merical weather prediction charts for wind and equivalent potential tempera ture at 850 hPa (850 hPa chart) provided by the Japan Meteorological Agency during the wet season in Japan. There was a good correlation between the o ccurrence of warm moist strong winds and immigration of rice planthoppers. An analysis of the 850 hPa chart could efficiently forecast rice planthoppe r immigrations into Kyushu in the wet seasons from 1996 to 1998. It was, th erefore, concluded that this chart is more useful than the low-level jet st ream data for investigating migration of rice planthoppers, because it give s not only information of wind but also temperature and humidity.